Bduck,
Hell Hole is actually a very nice lake and has some excellent kokes in it. When I was a kid (in the 60's) it was a new lake in a very remote and rough canyon on the Rubicon. In the years before that my Dad and his friends used to hunt bear in it as it was an area that had many bears and it was a place that the Parks dept would release the bad bears out of Yosemite Park.
We have done well there trolling for kokes along the East side of the lake, by the dam and by the water inflow on the West side. The kokes can run @ 15 inches in a good year. The camping is at the top of the hill away from the lake as well as boat camping in the back of the lake.
It has some really nice German Browns and some macks in it. Also, 2 nice streams feed it and they are full of nice raimbows. Overall...its a really nice, remote lake and very unique for Calif. lakes.